Known as Largo di Torre Argentina, this archaeological wonder was excavated as part of Mussolini's rebuilding efforts in 1929, revealing extensive multi-level temples that lie sunken 20 feet below modern street level. Besides several different temples, Torre Argentina also contains part of the famous Theater of Pompey, upon whose steps dictator Julius Caesar was betrayed and killed in 44 BCE. Today, volunteers at Torre Argentina care for approximately 250 cats. After the site was excavated, Rome's feral cats moved in immediately, as they do all over the city, and the gattare, or cat ladies, began feeding and caring for them. Since the mid-1990s, the population has grown from about 90 to the current 250, and the organization has ramped up with care for sick or wounded cats, as well as an extensive spay and neuter program to keep the feral population in check. Most of the permanent residents have special needs - they are blind or missing legs or came from abusive homes.

On any given afternoon a small crowd gathers here to watch the cats sunbathe on ancient pillars and steps. At first it may be hard to spot the cats, but once you start to see them, they are everywhere. Visitors can admire the cats and their ruins from street level, volunteer, and even adopt cats.